This file is indexed.

/usr/share/gnome-control-center/keybindings/50-metacity-system.xml is in metacity-common 1:2.34.1-1ubuntu11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<KeyListEntries wm_name="Metacity" package="metacity" group="system" name="System">

	<KeyListEntry name="/apps/metacity/global_keybindings/panel_run_dialog"/>

	<KeyListEntry name="/apps/metacity/global_keybindings/panel_main_menu"/>

</KeyListEntries>